Knife.



K. J. WILSON.

KNIFE.

lAIILIOA'IION FILED JAN. 20, 1909. 936,592. Patented Oct. 12, 1909.

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'KENNETH JOHN WILSON, 0F NEW YORK, Y.

KNIFE.

Specification of Letters Patent.

Patented Oct. 12, 1909.

Application filed .Tanuary 20, 1909. Serial No. 473,307.

To all whom 'it may concern:

Be it known that I, KENNETH J OHN WIL- son, a subject of the King ofGreat Britain, residlng in the borough of Manhattan, city,

county, and State of New York, have 1n-v vented certain new andusefullmprovements in Knives, of which the following is a specilication.

My improvements relate to the class of knives in which the blade ismovable lon tudina-lly in and with relation to the handi; and theinvention consists in the specific construction andarrangement of partshereinafter described and claimed, a distinguishing feature being theformation of one edge of the blade with inwardly inclined ratchet teethin conjunction with a spring pawl' on the handle, whereby the blade maybe read lly jarred, shaken or pulled out of 'the handle, more or less asrequired, but cannotbe pushed inward without drawing back the springpawl. Being designed more par ticularly for use as a printers patch upor over-lay blade, this feature is of special importa-nce since itadmits of the projection and manipulation of the blade by the hand only,while affording ample protection for the blade when not required forimmediate use.

l Inthe accompanying drawinvs, Figurel l, is an elevation of the devicewith the blade partly protruding; Fig. 2,. is alongitudinal section ofthe handle, showing the blade in elevation. A y

The handle H, is formed With-'the longitudinal recess or socket h, ofsuilicient llength and capacity to receive and inclose the whole of theblade B, when not desired for use,4

and when it is desired to protect its point p, andcutting edge o, fromcontact with extraneous objects. The point p', of the blade isconvergent centrally, and is double edged, to act as an incisor forprinters use in patch up and over or under lay work. One longitudinaledge'e, is also formed as a cutting edge which may beapplied for theuses to which Aordinary pocket knife blades are ein loyed. Y

The other longitudinal edge e', is ormed with ratchet teeth 7*, whichare inclined rearward, 'or away from the pointed end of the blade.IlContacting with these ratchet teeth l r, is a spring pawl s, whichautomatically engages the lateral shoulders of the' ratchet 'pointed endp,-while aifording but slight resistance to the movement of the blade inthe opposite direction, or outward,-since the inclined sides of theratchet teeth ride easily under the spring pawl, which latter has butslight resisting power to motion in that direction while sufficientlystiff to hold its shoulder s', locked with the transverse shoulder ofany of the ratchet teeth against movement inward, or in the opposite'direction. In other words the blade may be either shaken, jarred ordra-wn out of the handle to any extent desired, but cannot be pushedintoI the handle until the shoulder s', of the spring pawl s, iswithdrawn from the ratchet teeth 1.

What I claim as my inventlon and desire to secure by Letters Patent is,

l. In a knife of the character designated, the combination of a pointedblade formed on one edge -With a seriesl of ratchet teeth, havingshoulders transverse to Jthe blade and with sides inclining inwardtherefrom toward the pointed end of the blade, and a handle formed witha socket to receive the blade, and a springpawl '0n the handle arrangedto engage the transverse shoulders of the ratchet teeth and prevent thepushing in of the blade while allowing the blade to be pulled, jarred orshaken outward for the purpose described.

2. In a knife of the character designated, the combination of a pointedblade formed with a longitudinal cutting edge on one side and on 'theother edge with a series of ratchet teeth having shoulders transverse tothe blade and with sides inclining inward therefrom toward the pointedend of the blade, a

handle formed with a socket to receive thel 3. In a knife of thecharacter designated,

the combination of a central convergent point, a longitudinal cuttingedge on one side and on the other side with a series of ratchetteethhaving shoulders transverse to the blade and with sides inclininginward the blade to be pulled, jarred or shaken outtherefrom toward thepointed end of the Ward for the purpose described. blade a handleformed-With a socket to receive the blade', and a spring pawl cn theKENNETH JOHN WILSON 5 handle arranged to engage the transverseWitnesses:

shoulders of thesratchet teeth and prevent 4 D. W. GARDNER,

the pushing n of the blade While allowing GEO. WM. MIATT.

